// stb_truetype.h - v0.7 - public domain
// authored from 2009-2013 by Sean Barrett / RAD Game Tools
//
//   This library processes TrueType files:
//        parse files
//        extract glyph metrics
//        extract glyph shapes
//        render glyphs to one-channel bitmaps with antialiasing (box filter)
//
//   Todo:
//        non-MS cmaps
//        crashproof on bad data
//        hinting? (no longer patented)
//        cleartype-style AA?
//        optimize: use simple memory allocator for intermediates
//        optimize: build edge-list directly from curves
//        optimize: rasterize directly from curves?
//
// ADDITIONAL CONTRIBUTORS
//
//   Mikko Mononen: compound shape support, more cmap formats
//   Tor Andersson: kerning, subpixel rendering
//
//   Bug/warning reports:
//       "Zer" on mollyrocket (with fix)
//       Cass Everitt
//       stoiko (Haemimont Games)
//       Brian Hook 
//       Walter van Niftrik
//
// VERSION HISTORY
//
//   0.7  (2013-09-25) bugfix: subpixel glyph bug fixed in 0.5 had come back
//   0.6c (2012-07-24) improve documentation
//   0.6b (2012-07-20) fix a few more warnings
//   0.6  (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels,
//                        stbtt_GetFontBoundingBox, stbtt_IsGlyphEmpty
//   0.5  (2011-12-09) bugfixes:
//                        subpixel glyph renderer computed wrong bounding box
//                        first vertex of shape can be off-curve (FreeSans)
//   0.4b (2011-12-03) fixed an error in the font baking example
//   0.4  (2011-12-01) kerning, subpixel rendering (tor)
//                    bugfixes for:
//                        codepoint-to-glyph conversion using table fmt=12
//                        codepoint-to-glyph conversion using table fmt=4
//                        stbtt_GetBakedQuad with non-square texture (Zer)
//                    updated Hello World! sample to use kerning and subpixel
//                    fixed some warnings
//   0.3  (2009-06-24) cmap fmt=12, compound shapes (MM)
//                    userdata, malloc-from-userdata, non-zero fill (STB)
//   0.2  (2009-03-11) Fix unsigned/signed char warnings
//   0.1  (2009-03-09) First public release
//
// LICENSE
//
//   This software is in the public domain. Where that dedication is not
//   recognized, you are granted a perpetual, irrevokable license to copy
//   and modify this file as you see fit.
//
// USAGE
//
//   Include this file in whatever places neeed to refer to it. In ONE C/C++
//   file, write:
//      #define STB_TRUETYPE_IMPLEMENTATION
//   before the #include of this file. This expands out the actual
//   implementation into that C/C++ file.
//
//   Simple 3D API (don't ship this, but it's fine for tools and quick start,
//                  and you can cut and paste from it to move to more advanced)
//           stbtt_BakeFontBitmap()               -- bake a font to a bitmap for use as texture
//           stbtt_GetBakedQuad()                 -- compute quad to draw for a given char
//
//   "Load" a font file from a memory buffer (you have to keep the buffer loaded)
//           stbtt_InitFont()
//           stbtt_GetFontOffsetForIndex()        -- use for TTC font collections
//
//   Render a unicode codepoint to a bitmap
//           stbtt_GetCodepointBitmap()           -- allocates and returns a bitmap
//           stbtt_MakeCodepointBitmap()          -- renders into bitmap you provide
//           stbtt_GetCodepointBitmapBox()        -- how big the bitmap must be
//
//   Character advance/positioning
//           stbtt_GetCodepointHMetrics()
//           stbtt_GetFontVMetrics()
//           stbtt_GetCodepointKernAdvance()
//
// ADDITIONAL DOCUMENTATION
//
//   Immediately after this block comment are a series of sample programs.
//
//   After the sample programs is the "header file" section. This section
//   includes documentation for each API function.
//
//   Some important concepts to understand to use this library:
//
//      Codepoint
//         Characters are defined by unicode codepoints, e.g. 65 is
//         uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is
//         the hiragana for "ma".
//
//      Glyph
//         A visual character shape (every codepoint is rendered as
//         some glyph)
//
//      Glyph index
//         A font-specific integer ID representing a glyph
//
//      Baseline
//         Glyph shapes are defined relative to a baseline, which is the
//         bottom of uppercase characters. Characters extend both above
//         and below the baseline.
//
//      Current Point
//         As you draw text to the screen, you keep track of a "current point"
//         which is the origin of each character. The current point's vertical
//         position is the baseline. Even "baked fonts" use this model.
//
//      Vertical Font Metrics
//         The vertical qualities of the font, used to vertically position
//         and space the characters. See docs for stbtt_GetFontVMetrics.
//
//      Font Size in Pixels or Points
//         The preferred interface for specifying font sizes in stb_truetype
//         is to specify how tall the font's vertical extent should be in pixels.
//         If that sounds good enough, skip the next paragraph.
//
//         Most font APIs instead use "points", which are a common typographic
//         measurement for describing font size, defined as 72 points per inch.
//         stb_truetype provides a point API for compatibility. However, true
//         "per inch" conventions don't make much sense on computer displays
//         since they different monitors have different number of pixels per
//         inch. For example, Windows traditionally uses a convention that
//         there are 96 pixels per inch, thus making 'inch' measurements have
//         nothing to do with inches, and thus effectively defining a point to
//         be 1.333 pixels. Additionally, the TrueType font data provides
//         an explicit scale factor to scale a given font's glyphs to points,
//         but the author has observed that this scale factor is often wrong
//         for non-commercial fonts, thus making fonts scaled in points
//         according to the TrueType spec incoherently sized in practice.
//
// ADVANCED USAGE
//
//   Quality:
//
//    - Use the functions with Subpixel at the end to allow your characters
//      to have subpixel positioning. Since the font is anti-aliased, not
//      hinted, this is very import for quality. (This is not possible with
//      baked fonts.)
//
//    - Kerning is now supported, and if you're supporting subpixel rendering
//      then kerning is worth using to give your text a polished look.
//
//   Performance:
//
//    - Convert Unicode codepoints to glyph indexes and operate on the glyphs;
//      if you don't do this, stb_truetype is forced to do the conversion on
//      every call.
//
//    - There are a lot of memory allocations. We should modify it to take
//      a temp buffer and allocate from the temp buffer (without freeing),
//      should help performance a lot.
//
// NOTES
//
//   The system uses the raw data found in the .ttf file without changing it
//   and without building auxiliary data structures. This is a bit inefficient
//   on little-endian systems (the data is big-endian), but assuming you're
//   caching the bitmaps or glyph shapes this shouldn't be a big deal.
//
//   It appears to be very hard to programmatically determine what font a
//   given file is in a general way. I provide an API for this, but I don't
//   recommend it.
//
//
// SOURCE STATISTICS (based on v0.6c, 2050 LOC)
//
//   Documentation & header file        520 LOC  \___ 660 LOC documentation
//   Sample code                        140 LOC  /
//   Truetype parsing                   620 LOC  ---- 620 LOC TrueType
//   Software rasterization             240 LOC  \                           .
//   Curve tesselation                  120 LOC   \__ 550 LOC Bitmap creation
//   Bitmap management                  100 LOC   /
//   Baked bitmap interface              70 LOC  /
//   Font name matching & access        150 LOC  ---- 150 
//   C runtime library abstraction       60 LOC  ----  60


//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
////
////  SAMPLE PROGRAMS
////
//
//  Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless
//
#if 0
#define STB_TRUETYPE_IMPLEMENTATION  // force following include to generate implementation
#include "stb_truetype.h"

char ttf_buffer[1<<20];
unsigned char temp_bitmap[512*512];

stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
GLstbtt_uint ftex;

void my_stbtt_initfont(void)
{
	fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
	stbtt_BakeFontBitmap(data,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits!
	// can free ttf_buffer at this point
	glGenTextures(1, &ftex);
	glBindTexture(GL_TEXTURE_2D, ftex);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
	// can free temp_bitmap at this point
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
}

void my_stbtt_print(float x, float y, char *text)
{
	// assume orthographic projection with units = screen pixels, origin at top left
	glBindTexture(GL_TEXTURE_2D, ftex);
	glBegin(GL_QUADS);
	while (*text) {
		if (*text >= 32 && *text < 128) {
			stbtt_aligned_quad q;
			stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl,0=old d3d
			glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y0);
			glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y0);
			glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y1);
			glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y1);
		}
		++text;
	}
	glEnd();
}
#endif
//
//
//////////////////////////////////////////////////////////////////////////////
//
// Complete program (this compiles): get a single bitmap, print as ASCII art
//
#if 0
#include <stdio.h>
#define STB_TRUETYPE_IMPLEMENTATION  // force following include to generate implementation
#include "stb_truetype.h"

char ttf_buffer[1<<25];

int main(int argc, char **argv)
{
	stbtt_fontinfo font;
	unsigned char *bitmap;
	int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20);

	fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb"));

	stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
	bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0);

	for (j=0; j < h; ++j) {
		for (i=0; i < w; ++i)
			putchar(" .:ioVM@"[bitmap[j*w+i]>>5]);
		putchar('\n');
	}
	return 0;
}
#endif 
//
// Output:
//
//     .ii.
//    @@@@@@.
//   V@Mio@@o
//   :i.  V@V
//     :oM@@M
//   :@@@MM@M
//   @@o  o@M
//  :@@.  M@M
//   @@@o@@@@
//   :M@@V:@@.
//  
//////////////////////////////////////////////////////////////////////////////
// 
// Complete program: print "Hello World!" banner, with bugs
//
#if 0
char buffer[24<<20];
unsigned char screen[20][79];

int main(int arg, char **argv)
{
	stbtt_fontinfo font;
	int i,j,ascent,baseline,ch=0;
	float scale, xpos=0;
	char *text = "Heljo World!";

	fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
	stbtt_InitFont(&font, buffer, 0);

	scale = stbtt_ScaleForPixelHeight(&font, 15);
	stbtt_GetFontVMetrics(&font, &ascent,0,0);
	baseline = (int) (ascent*scale);

	while (text[ch]) {
		int advance,lsb,x0,y0,x1,y1;
		float x_shift = xpos - (float) floor(xpos);
		stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb);
		stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1);
		stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]);
		// note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong
		// because this API is really for baking character bitmaps into textures. if you want to render
		// a sequence of characters, you really need to render each bitmap to a temp buffer, then
		// "alpha blend" that into the working buffer
		xpos += (advance * scale);
		if (text[ch+1])
			xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]);
		++ch;
	}

	for (j=0; j < 20; ++j) {
		for (i=0; i < 78; ++i)
			putchar(" .:ioVM@"[screen[j][i]>>5]);
		putchar('\n');
	}

	return 0;
}
#endif


//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
////
////   INTEGRATION WITH YOUR CODEBASE
////
////   The following sections allow you to supply alternate definitions
////   of C library functions used by stb_truetype.

#ifdef STB_TRUETYPE_IMPLEMENTATION
// #define your own (u)stbtt_int8/16/32 before including to override this
#ifndef stbtt_uint8
typedef unsigned char   stbtt_uint8;
typedef signed   char   stbtt_int8;
typedef unsigned short  stbtt_uint16;
typedef signed   short  stbtt_int16;
typedef unsigned int    stbtt_uint32;
typedef signed   int    stbtt_int32;
#endif

typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];

// #define your own STBTT_sort() to override this to avoid qsort
#ifndef STBTT_sort
#include <stdlib.h>
#define STBTT_sort(data,num_items,item_size,compare_func)   qsort(data,num_items,item_size,compare_func)
#endif

// #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
#ifndef STBTT_ifloor
#include <math.h>
#define STBTT_ifloor(x)   ((int) floor(x))
#define STBTT_iceil(x)    ((int) ceil(x))
#endif

// #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h
#ifndef STBTT_malloc
#include <malloc.h>
#define STBTT_malloc(x,u)  malloc(x)
#define STBTT_free(x,u)    free(x)
#endif

#ifndef STBTT_assert
#include <assert.h>
#define STBTT_assert(x)    assert(x)
#endif

#ifndef STBTT_strlen
#include <string.h>
#define STBTT_strlen(x)    strlen(x)
#endif

#ifndef STBTT_memcpy
#include <memory.h>
#define STBTT_memcpy       memcpy
#define STBTT_memset       memset
#endif
#endif

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
////
////   INTERFACE
////
////

#ifndef __STB_INCLUDE_STB_TRUETYPE_H__
#define __STB_INCLUDE_STB_TRUETYPE_H__

#ifdef __cplusplus
extern "C" {
#endif

	//////////////////////////////////////////////////////////////////////////////
	//
	// TEXTURE BAKING API
	//
	// If you use this API, you only have to call two functions ever.
	//

	typedef struct
	{
		unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
		float xoff,yoff,xadvance;   
	} stbtt_bakedchar;

	extern int stbtt_BakeFontBitmap(const unsigned char *data, int offset,  // font location (use offset=0 for plain .ttf)
		float pixel_height,                     // height of font in pixels
		unsigned char *pixels, int pw, int ph,  // bitmap to be filled in
		int first_char, int num_chars,          // characters to bake
		stbtt_bakedchar *chardata);             // you allocate this, it's num_chars long
	// if return is positive, the first unused row of the bitmap
	// if return is negative, returns the negative of the number of characters that fit
	// if return is 0, no characters fit and no rows were used
	// This uses a very crappy packing.

	typedef struct
	{
		float x0,y0,s0,t0; // top-left
		float x1,y1,s1,t1; // bottom-right
	} stbtt_aligned_quad;

	extern void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph,  // same data as above
		int char_index,             // character to display
		float *xpos, float *ypos,   // pointers to current position in screen pixel space
		stbtt_aligned_quad *q,      // output: quad to draw
		int opengl_fillrule);       // true if opengl fill rule; false if DX9 or earlier
	// Call GetBakedQuad with char_index = 'character - first_char', and it
	// creates the quad you need to draw and advances the current position.
	//
	// The coordinate system used assumes y increases downwards.
	//
	// Characters will extend both above and below the current position;
	// see discussion of "BASELINE" above.
	//
	// It's inefficient; you might want to c&p it and optimize it.


	//////////////////////////////////////////////////////////////////////////////
	//
	// FONT LOADING
	//
	//

	extern int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
	// Each .ttf/.ttc file may have more than one font. Each font has a sequential
	// index number starting from 0. Call this function to get the font offset for
	// a given index; it returns -1 if the index is out of range. A regular .ttf
	// file will only define one font and it always be at offset 0, so it will
	// return '0' for index 0, and -1 for all other indices. You can just skip
	// this step if you know it's that kind of font.


	// The following structure is defined publically so you can declare one on
	// the stack or as a global or etc, but you should treat it as opaque.
	typedef struct stbtt_fontinfo
	{
		void           * userdata;
		unsigned char  * data;              // pointer to .ttf file
		int              fontstart;         // offset of start of font

		int numGlyphs;                     // number of glyphs, needed for range checking

		int loca,head,glyf,hhea,hmtx,kern; // table locations as offset from start of .ttf
		int index_map;                     // a cmap mapping for our chosen character encoding
		int indexToLocFormat;              // format needed to map from glyph index to glyph
	} stbtt_fontinfo;

	extern int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset);
	// Given an offset into the file that defines a font, this function builds
	// the necessary cached info for the rest of the system. You must allocate
	// the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't
	// need to do anything special to free it, because the contents are pure
	// value data with no additional data structures. Returns 0 on failure.


	//////////////////////////////////////////////////////////////////////////////
	//
	// CHARACTER TO GLYPH-INDEX CONVERSIOn

	int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint);
	// If you're going to perform multiple operations on the same character
	// and you want a speed-up, call this function with the character you're
	// going to process, then use glyph-based functions instead of the
	// codepoint-based functions.


	//////////////////////////////////////////////////////////////////////////////
	//
	// CHARACTER PROPERTIES
	//

	extern float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels);
	// computes a scale factor to produce a font whose "height" is 'pixels' tall.
	// Height is measured as the distance from the highest ascender to the lowest
	// descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics
	// and computing:
	//       scale = pixels / (ascent - descent)
	// so if you prefer to measure height by the ascent only, use a similar calculation.

	extern float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels);
	// computes a scale factor to produce a font whose EM size is mapped to
	// 'pixels' tall. This is probably what traditional APIs compute, but
	// I'm not positive.

	extern void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap);
	// ascent is the coordinate above the baseline the font extends; descent
	// is the coordinate below the baseline the font extends (i.e. it is typically negative)
	// lineGap is the spacing between one row's descent and the next row's ascent...
	// so you should advance the vertical position by "*ascent - *descent + *lineGap"
	//   these are expressed in unscaled coordinates, so you must multiply by
	//   the scale factor for a given size

	extern void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1);
	// the bounding box around all possible characters

	extern void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing);
	// leftSideBearing is the offset from the current horizontal position to the left edge of the character
	// advanceWidth is the offset from the current horizontal position to the next horizontal position
	//   these are expressed in unscaled coordinates

	extern int  stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2);
	// an additional amount to add to the 'advance' value between ch1 and ch2
	// @TODO; for now always returns 0!

	extern int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1);
	// Gets the bounding box of the visible part of the glyph, in unscaled coordinates

	extern void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing);
	extern int  stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2);
	extern int  stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
	// as above, but takes one or more glyph indices for greater efficiency


	//////////////////////////////////////////////////////////////////////////////
	//
	// GLYPH SHAPES (you probably don't need these, but they have to go before
	// the bitmaps for C declaration-order reasons)
	//

#ifndef STBTT_vmove // you can predefine these to use different values (but why?)
	enum {
		STBTT_vmove=1,
		STBTT_vline,
		STBTT_vcurve
	};
#endif

#ifndef stbtt_vertex // you can predefine this to use different values
	// (we share this with other code at RAD)
#define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file
	typedef struct
	{
		stbtt_vertex_type x,y,cx,cy;
		unsigned char type,padding;
	} stbtt_vertex;
#endif

	extern int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
	// returns non-zero if nothing is drawn for this glyph

	extern int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices);
	extern int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices);
	// returns # of vertices and fills *vertices with the pointer to them
	//   these are expressed in "unscaled" coordinates

	extern void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
	// frees the data allocated above

	//////////////////////////////////////////////////////////////////////////////
	//
	// BITMAP RENDERING
	//

	extern void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
	// frees the bitmap allocated below

	extern unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
	// allocates a large-enough single-channel 8bpp bitmap and renders the
	// specified character/glyph at the specified scale into it, with
	// antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque).
	// *width & *height are filled out with the width & height of the bitmap,
	// which is stored left-to-right, top-to-bottom.
	//
	// xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap

	extern unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
	// the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel
	// shift for the character

	extern void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint);
	// the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap
	// in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap
	// is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the
	// width and height and positioning info for it first.

	extern void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint);
	// same as stbtt_MakeCodepointBitmap, but you can specify a subpixel
	// shift for the character

	extern void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
	// get the bbox of the bitmap centered around the glyph origin; so the
	// bitmap width is ix1-ix0, height is iy1-iy0, and location to place
	// the bitmap top left is (leftSideBearing*scale,iy0).
	// (Note that the bitmap uses y-increases-down, but the shape uses
	// y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.)

	extern void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
	// same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel
	// shift for the character

	// the following functions are equivalent to the above functions, but operate
	// on glyph indices instead of Unicode codepoints (for efficiency)
	extern unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff);
	extern unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff);
	extern void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph);
	extern void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph);
	extern void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
	extern void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);


	// @TODO: don't expose this structure
	typedef struct
	{
		int w,h,stride;
		unsigned char *pixels;
	} stbtt__bitmap;

	extern void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata);

	//////////////////////////////////////////////////////////////////////////////
	//
	// Finding the right font...
	//
	// You should really just solve this offline, keep your own tables
	// of what font is what, and don't try to get it out of the .ttf file.
	// That's because getting it out of the .ttf file is really hard, because
	// the names in the file can appear in many possible encodings, in many
	// possible languages, and e.g. if you need a case-insensitive comparison,
	// the details of that depend on the encoding & language in a complex way
	// (actually underspecified in truetype, but also gigantic).
	//
	// But you can use the provided functions in two possible ways:
	//     stbtt_FindMatchingFont() will use *case-sensitive* comparisons on
	//             unicode-encoded names to try to find the font you want;
	//             you can run this before calling stbtt_InitFont()
	//
	//     stbtt_GetFontNameString() lets you get any of the various strings
	//             from the file yourself and do your own comparisons on them.
	//             You have to have called stbtt_InitFont() first.


	extern int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags);
	// returns the offset (not index) of the font that matches, or -1 if none
	//   if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold".
	//   if you use any other flag, use a font name like "Arial"; this checks
	//     the 'macStyle' header field; i don't know if fonts set this consistently
#define STBTT_MACSTYLE_DONTCARE     0
#define STBTT_MACSTYLE_BOLD         1
#define STBTT_MACSTYLE_ITALIC       2
#define STBTT_MACSTYLE_UNDERSCORE   4
#define STBTT_MACSTYLE_NONE         8   // <= not same as 0, this makes us check the bitfield is 0

	extern int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2);
	// returns 1/0 whether the first string interpreted as utf8 is identical to
	// the second string interpreted as big-endian utf16... useful for strings from next func

	extern const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID);
	// returns the string (which may be big-endian double byte, e.g. for unicode)
	// and puts the length in bytes in *length.
	//
	// some of the values for the IDs are below; for more see the truetype spec:
	//     http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html
	//     http://www.microsoft.com/typography/otspec/name.htm

	enum { // platformID
		STBTT_PLATFORM_ID_UNICODE   =0,
		STBTT_PLATFORM_ID_MAC       =1,
		STBTT_PLATFORM_ID_ISO       =2,
		STBTT_PLATFORM_ID_MICROSOFT =3
	};

	enum { // encodingID for STBTT_PLATFORM_ID_UNICODE
		STBTT_UNICODE_EID_UNICODE_1_0    =0,
		STBTT_UNICODE_EID_UNICODE_1_1    =1,
		STBTT_UNICODE_EID_ISO_10646      =2,
		STBTT_UNICODE_EID_UNICODE_2_0_BMP=3,
		STBTT_UNICODE_EID_UNICODE_2_0_FULL=4
	};

	enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT
		STBTT_MS_EID_SYMBOL        =0,
		STBTT_MS_EID_UNICODE_BMP   =1,
		STBTT_MS_EID_SHIFTJIS      =2,
		STBTT_MS_EID_UNICODE_FULL  =10
	};

	enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes
		STBTT_MAC_EID_ROMAN        =0,   STBTT_MAC_EID_ARABIC       =4,
		STBTT_MAC_EID_JAPANESE     =1,   STBTT_MAC_EID_HEBREW       =5,
		STBTT_MAC_EID_CHINESE_TRAD =2,   STBTT_MAC_EID_GREEK        =6,
		STBTT_MAC_EID_KOREAN       =3,   STBTT_MAC_EID_RUSSIAN      =7
	};

	enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID...
		// problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs
		STBTT_MS_LANG_ENGLISH     =0x0409,   STBTT_MS_LANG_ITALIAN     =0x0410,
		STBTT_MS_LANG_CHINESE     =0x0804,   STBTT_MS_LANG_JAPANESE    =0x0411,
		STBTT_MS_LANG_DUTCH       =0x0413,   STBTT_MS_LANG_KOREAN      =0x0412,
		STBTT_MS_LANG_FRENCH      =0x040c,   STBTT_MS_LANG_RUSSIAN     =0x0419,
		STBTT_MS_LANG_GERMAN      =0x0407,   STBTT_MS_LANG_SPANISH     =0x0409,
		STBTT_MS_LANG_HEBREW      =0x040d,   STBTT_MS_LANG_SWEDISH     =0x041D
	};

	enum { // languageID for STBTT_PLATFORM_ID_MAC
		STBTT_MAC_LANG_ENGLISH      =0 ,   STBTT_MAC_LANG_JAPANESE     =11,
		STBTT_MAC_LANG_ARABIC       =12,   STBTT_MAC_LANG_KOREAN       =23,
		STBTT_MAC_LANG_DUTCH        =4 ,   STBTT_MAC_LANG_RUSSIAN      =32,
		STBTT_MAC_LANG_FRENCH       =1 ,   STBTT_MAC_LANG_SPANISH      =6 ,
		STBTT_MAC_LANG_GERMAN       =2 ,   STBTT_MAC_LANG_SWEDISH      =5 ,
		STBTT_MAC_LANG_HEBREW       =10,   STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33,
		STBTT_MAC_LANG_ITALIAN      =3 ,   STBTT_MAC_LANG_CHINESE_TRAD =19
	};

#ifdef __cplusplus
}
#endif

#endif // __STB_INCLUDE_STB_TRUETYPE_H__

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
////
////   IMPLEMENTATION
////
////

#ifdef STB_TRUETYPE_IMPLEMENTATION

//////////////////////////////////////////////////////////////////////////
//
// accessors to parse data from file
//

// on platforms that don't allow misaligned reads, if we want to allow
// truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE

#define ttBYTE(p)     (* (stbtt_uint8 *) (p))
#define ttCHAR(p)     (* (stbtt_int8 *) (p))
#define ttFixed(p)    ttLONG(p)

#if defined(STB_TRUETYPE_BIGENDIAN) && !defined(ALLOW_UNALIGNED_TRUETYPE)

#define ttUSHORT(p)   (* (stbtt_uint16 *) (p))
#define ttSHORT(p)    (* (stbtt_int16 *) (p))
#define ttULONG(p)    (* (stbtt_uint32 *) (p))
#define ttLONG(p)     (* (stbtt_int32 *) (p))

#else

stbtt_uint16 ttUSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
stbtt_int16 ttSHORT(const stbtt_uint8 *p)   { return p[0]*256 + p[1]; }
stbtt_uint32 ttULONG(const stbtt_uint8 *p)  { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
stbtt_int32 ttLONG(const stbtt_uint8 *p)    { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }

#endif

#define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3))
#define stbtt_tag(p,str)           stbtt_tag4(p,str[0],str[1],str[2],str[3])

static int stbtt__isfont(const stbtt_uint8 *font)
{
	// check the version number
	if (stbtt_tag4(font, '1',0,0,0))  return 1; // TrueType 1
	if (stbtt_tag(font, "typ1"))   return 1; // TrueType with type 1 font -- we don't support this!
	if (stbtt_tag(font, "OTTO"))   return 1; // OpenType with CFF
	if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0
	return 0;
}

// @OPTIMIZE: binary search
static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag)
{
	stbtt_int32 num_tables = ttUSHORT(data+fontstart+4);
	stbtt_uint32 tabledir = fontstart + 12;
	stbtt_int32 i;
	for (i=0; i < num_tables; ++i) {
		stbtt_uint32 loc = tabledir + 16*i;
		if (stbtt_tag(data+loc+0, tag))
			return ttULONG(data+loc+8);
	}
	return 0;
}

int stbtt_GetFontOffsetForIndex(const unsigned char *font_collection, int index)
{
	// if it's just a font, there's only one valid index
	if (stbtt__isfont(font_collection))
		return index == 0 ? 0 : -1;

	// check if it's a TTC
	if (stbtt_tag(font_collection, "ttcf")) {
		// version 1?
		if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
			stbtt_int32 n = ttLONG(font_collection+8);
			if (index >= n)
				return -1;
			return ttULONG(font_collection+12+index*14);
		}
	}
	return -1;
}

int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data2, int fontstart)
{
	stbtt_uint8 *data = (stbtt_uint8 *) data2;
	stbtt_uint32 cmap, t;
	stbtt_int32 i,numTables;

	info->data = data;
	info->fontstart = fontstart;

	cmap = stbtt__find_table(data, fontstart, "cmap");       // required
	info->loca = stbtt__find_table(data, fontstart, "loca"); // required
	info->head = stbtt__find_table(data, fontstart, "head"); // required
	info->glyf = stbtt__find_table(data, fontstart, "glyf"); // required
	info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required
	info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required
	info->kern = stbtt__find_table(data, fontstart, "kern"); // not required
	if (!cmap || !info->loca || !info->head || !info->glyf || !info->hhea || !info->hmtx)
		return 0;

	t = stbtt__find_table(data, fontstart, "maxp");
	if (t)
		info->numGlyphs = ttUSHORT(data+t+4);
	else
		info->numGlyphs = 0xffff;

	// find a cmap encoding table we understand *now* to avoid searching
	// later. (todo: could make this installable)
	// the same regardless of glyph.
	numTables = ttUSHORT(data + cmap + 2);
	info->index_map = 0;
	for (i=0; i < numTables; ++i) {
		stbtt_uint32 encoding_record = cmap + 4 + 8 * i;
		// find an encoding we understand:
		switch(ttUSHORT(data+encoding_record)) {
		case STBTT_PLATFORM_ID_MICROSOFT:
			switch (ttUSHORT(data+encoding_record+2)) {
			case STBTT_MS_EID_UNICODE_BMP:
			case STBTT_MS_EID_UNICODE_FULL:
				// MS/Unicode
				info->index_map = cmap + ttULONG(data+encoding_record+4);
				break;
			}
			break;
		}
	}
	if (info->index_map == 0)
		return 0;

	info->indexToLocFormat = ttUSHORT(data+info->head + 50);
	return 1;
}

int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint)
{
	stbtt_uint8 *data = info->data;
	stbtt_uint32 index_map = info->index_map;

	stbtt_uint16 format = ttUSHORT(data + index_map + 0);
	if (format == 0) { // apple byte encoding
		stbtt_int32 bytes = ttUSHORT(data + index_map + 2);
		if (unicode_codepoint < bytes-6)
			return ttBYTE(data + index_map + 6 + unicode_codepoint);
		return 0;
	} else if (format == 6) {
		stbtt_uint32 first = ttUSHORT(data + index_map + 6);
		stbtt_uint32 count = ttUSHORT(data + index_map + 8);
		if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count)
			return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2);
		return 0;
	} else if (format == 2) {
		STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean
		return 0;
	} else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges
		stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1;
		stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1;
		stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10);
		stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1;
		stbtt_uint16 item, offset, start, end;

		// do a binary search of the segments
		stbtt_uint32 endCount = index_map + 14;
		stbtt_uint32 search = endCount;

		if (unicode_codepoint > 0xffff)
			return 0;

		// they lie from endCount .. endCount + segCount
		// but searchRange is the nearest power of two, so...
		if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2))
			search += rangeShift*2;

		// now decrement to bias correctly to find smallest
		search -= 2;
		while (entrySelector) {
			stbtt_uint16 start, end;
			searchRange >>= 1;
			start = ttUSHORT(data + search + 2 + segcount*2 + 2);
			end = ttUSHORT(data + search + 2);
			start = ttUSHORT(data + search + searchRange*2 + segcount*2 + 2);
			end = ttUSHORT(data + search + searchRange*2);
			if (unicode_codepoint > end)
				search += searchRange*2;
			--entrySelector;
		}
		search += 2;

		item = (stbtt_uint16) ((search - endCount) >> 1);

		STBTT_assert(unicode_codepoint <= ttUSHORT(data + endCount + 2*item));
		start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
		end = ttUSHORT(data + index_map + 14 + 2 + 2*item);
		if (unicode_codepoint < start)
			return 0;

		offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item);
		if (offset == 0)
			return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item));

		return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item);
	} else if (format == 12 || format == 13) {
		stbtt_uint32 ngroups = ttULONG(data+index_map+12);
		stbtt_int32 low,high;
		low = 0; high = (stbtt_int32)ngroups;
		// Binary search the right group.
		while (low < high) {
			stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high
			stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12);
			stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4);
			if ((stbtt_uint32) unicode_codepoint < start_char)
				high = mid;
			else if ((stbtt_uint32) unicode_codepoint > end_char)
				low = mid+1;
			else {
				stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8);
				if (format == 12)
					return start_glyph + unicode_codepoint-start_char;
				else // format == 13
					return start_glyph;
			}
		}
		return 0; // not found
	}
	// @TODO
	STBTT_assert(0);
	return 0;
}

int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices)
{
	return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices);
}

static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy)
{
	v->type = type;
	v->x = (stbtt_int16) x;
	v->y = (stbtt_int16) y;
	v->cx = (stbtt_int16) cx;
	v->cy = (stbtt_int16) cy;
}

static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index)
{
	int g1,g2;

	if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range
	if (info->indexToLocFormat >= 2)    return -1; // unknown index->glyph map format

	if (info->indexToLocFormat == 0) {
		g1 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2) * 2;
		g2 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2;
	} else {
		g1 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4);
		g2 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4 + 4);
	}

	return g1==g2 ? -1 : g1; // if length is 0, return -1
}

int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
{
	int g = stbtt__GetGlyfOffset(info, glyph_index);
	if (g < 0) return 0;

	if (x0) *x0 = ttSHORT(info->data + g + 2);
	if (y0) *y0 = ttSHORT(info->data + g + 4);
	if (x1) *x1 = ttSHORT(info->data + g + 6);
	if (y1) *y1 = ttSHORT(info->data + g + 8);
	return 1;
}

int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1)
{
	return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1);
}

int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index)
{
	stbtt_int16 numberOfContours;
	int g = stbtt__GetGlyfOffset(info, glyph_index);
	if (g < 0) return 1;
	numberOfContours = ttSHORT(info->data + g);
	return numberOfContours == 0;
}

static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off,
	stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy)
{
	if (start_off) {
		if (was_off)
			stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy);
		stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, sx,sy,scx,scy);
	} else {
		if (was_off)
			stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve,sx,sy,cx,cy);
		else
			stbtt_setvertex(&vertices[num_vertices++], STBTT_vline,sx,sy,0,0);
	}
	return num_vertices;
}

int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
{
	stbtt_int16 numberOfContours;
	stbtt_uint8 *endPtsOfContours;
	stbtt_uint8 *data = info->data;
	stbtt_vertex *vertices=0;
	int num_vertices=0;
	int g = stbtt__GetGlyfOffset(info, glyph_index);

	*pvertices = NULL;

	if (g < 0) return 0;

	numberOfContours = ttSHORT(data + g);

	if (numberOfContours > 0) {
		stbtt_uint8 flags=0,flagcount;
		stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0;
		stbtt_int32 x,y,cx,cy,sx,sy, scx,scy;
		stbtt_uint8 *points;
		endPtsOfContours = (data + g + 10);
		ins = ttUSHORT(data + g + 10 + numberOfContours * 2);
		points = data + g + 10 + numberOfContours * 2 + 2 + ins;

		n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2);

		m = n + 2*numberOfContours;  // a loose bound on how many vertices we might need
		vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata);
		if (vertices == 0)
			return 0;

		next_move = 0;
		flagcount=0;

		// in first pass, we load uninterpreted data into the allocated array
		// above, shifted to the end of the array so we won't overwrite it when
		// we create our final data starting from the front

		off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated

		// first load flags

		for (i=0; i < n; ++i) {
			if (flagcount == 0) {
				flags = *points++;
				if (flags & 8)
					flagcount = *points++;
			} else
				--flagcount;
			vertices[off+i].type = flags;
		}

		// now load x coordinates
		x=0;
		for (i=0; i < n; ++i) {
			flags = vertices[off+i].type;
			if (flags & 2) {
				stbtt_int16 dx = *points++;
				x += (flags & 16) ? dx : -dx; // ???
			} else {
				if (!(flags & 16)) {
					x = x + (stbtt_int16) (points[0]*256 + points[1]);
					points += 2;
				}
			}
			vertices[off+i].x = (stbtt_int16) x;
		}

		// now load y coordinates
		y=0;
		for (i=0; i < n; ++i) {
			flags = vertices[off+i].type;
			if (flags & 4) {
				stbtt_int16 dy = *points++;
				y += (flags & 32) ? dy : -dy; // ???
			} else {
				if (!(flags & 32)) {
					y = y + (stbtt_int16) (points[0]*256 + points[1]);
					points += 2;
				}
			}
			vertices[off+i].y = (stbtt_int16) y;
		}

		// now convert them to our format
		num_vertices=0;
		sx = sy = cx = cy = scx = scy = 0;
		for (i=0; i < n; ++i) {
			flags = vertices[off+i].type;
			x     = (stbtt_int16) vertices[off+i].x;
			y     = (stbtt_int16) vertices[off+i].y;

			if (next_move == i) {
				if (i != 0)
					num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);

				// now start the new one               
				start_off = !(flags & 1);
				if (start_off) {
					// if we start off with an off-curve point, then when we need to find a point on the curve
					// where we can start, and we need to save some state for when we wraparound.
					scx = x;
					scy = y;
					if (!(vertices[off+i+1].type & 1)) {
						// next point is also a curve point, so interpolate an on-point curve
						sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1;
						sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1;
					} else {
						// otherwise just use the next point as our start point
						sx = (stbtt_int32) vertices[off+i+1].x;
						sy = (stbtt_int32) vertices[off+i+1].y;
						++i; // we're using point i+1 as the starting point, so skip it
					}
				} else {
					sx = x;
					sy = y;
				}
				stbtt_setvertex(&vertices[num_vertices++], STBTT_vmove,sx,sy,0,0);
				was_off = 0;
				next_move = 1 + ttUSHORT(endPtsOfContours+j*2);
				++j;
			} else {
				if (!(flags & 1)) { // if it's a curve
					if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint
						stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy);
					cx = x;
					cy = y;
					was_off = 1;
				} else {
					if (was_off)
						stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, x,y, cx, cy);
					else
						stbtt_setvertex(&vertices[num_vertices++], STBTT_vline, x,y,0,0);
					was_off = 0;
				}
			}
		}
		num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
	} else if (numberOfContours == -1) {
		// Compound shapes.
		int more = 1;
		stbtt_uint8 *comp = data + g + 10;
		num_vertices = 0;
		vertices = 0;
		while (more) {
			stbtt_uint16 flags, gidx;
			int comp_num_verts = 0, i;
			stbtt_vertex *comp_verts = 0, *tmp = 0;
			float mtx[6] = {1,0,0,1,0,0}, m, n;

			flags = ttSHORT(comp); comp+=2;
			gidx = ttSHORT(comp); comp+=2;

			if (flags & 2) { // XY values
				if (flags & 1) { // shorts
					mtx[4] = ttSHORT(comp); comp+=2;
					mtx[5] = ttSHORT(comp); comp+=2;
				} else {
					mtx[4] = ttCHAR(comp); comp+=1;
					mtx[5] = ttCHAR(comp); comp+=1;
				}
			}
			else {
				// @TODO handle matching point
				STBTT_assert(0);
			}
			if (flags & (1<<3)) { // WE_HAVE_A_SCALE
				mtx[0] = mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
				mtx[1] = mtx[2] = 0;
			} else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE
				mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
				mtx[1] = mtx[2] = 0;
				mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
			} else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO
				mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
				mtx[1] = ttSHORT(comp)/16384.0f; comp+=2;
				mtx[2] = ttSHORT(comp)/16384.0f; comp+=2;
				mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
			}

			// Find transformation scales.
			m = (float) sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
			n = (float) sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]);

			// Get indexed glyph.
			comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts);
			if (comp_num_verts > 0) {
				// Transform vertices.
				for (i = 0; i < comp_num_verts; ++i) {
					stbtt_vertex* v = &comp_verts[i];
					stbtt_vertex_type x,y;
					x=v->x; y=v->y;
					v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
					v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
					x=v->cx; y=v->cy;
					v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
					v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
				}
				// Append vertices.
				tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata);
				if (!tmp) {
					if (vertices) STBTT_free(vertices, info->userdata);
					if (comp_verts) STBTT_free(comp_verts, info->userdata);
					return 0;
				}
				if (num_vertices > 0) memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
				memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
				if (vertices) STBTT_free(vertices, info->userdata);
				vertices = tmp;
				STBTT_free(comp_verts, info->userdata);
				num_vertices += comp_num_verts;
			}
			// More components ?
			more = flags & (1<<5);
		}
	} else if (numberOfContours < 0) {
		// @TODO other compound variations?
		STBTT_assert(0);
	} else {
		// numberOfCounters == 0, do nothing
	}

	*pvertices = vertices;
	return num_vertices;
}

void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing)
{
	stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34);
	if (glyph_index < numOfLongHorMetrics) {
		if (advanceWidth)     *advanceWidth    = ttSHORT(info->data + info->hmtx + 4*glyph_index);
		if (leftSideBearing)  *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2);
	} else {
		if (advanceWidth)     *advanceWidth    = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1));
		if (leftSideBearing)  *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics));
	}
}

int  stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
{
	stbtt_uint8 *data = info->data + info->kern;
	stbtt_uint32 needle, straw;
	int l, r, m;

	// we only look at the first table. it must be 'horizontal' and format 0.
	if (!info->kern)
		return 0;
	if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
		return 0;
	if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
		return 0;

	l = 0;
	r = ttUSHORT(data+10) - 1;
	needle = glyph1 << 16 | glyph2;
	while (l <= r) {
		m = (l + r) >> 1;
		straw = ttULONG(data+18+(m*6)); // note: unaligned read
		if (needle < straw)
			r = m - 1;
		else if (needle > straw)
			l = m + 1;
		else
			return ttSHORT(data+22+(m*6));
	}
	return 0;
}

int  stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2)
{
	if (!info->kern) // if no kerning table, don't waste time looking up both codepoint->glyphs
		return 0;
	return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2));
}

void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing)
{
	stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing);
}

void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap)
{
	if (ascent ) *ascent  = ttSHORT(info->data+info->hhea + 4);
	if (descent) *descent = ttSHORT(info->data+info->hhea + 6);
	if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8);
}

void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1)
{
	*x0 = ttSHORT(info->data + info->head + 36);
	*y0 = ttSHORT(info->data + info->head + 38);
	*x1 = ttSHORT(info->data + info->head + 40);
	*y1 = ttSHORT(info->data + info->head + 42);
}

float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height)
{
	int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data + info->hhea + 6);
	return (float) height / fheight;
}

float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels)
{
	int unitsPerEm = ttUSHORT(info->data + info->head + 18);
	return pixels / unitsPerEm;
}

void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
{
	STBTT_free(v, info->userdata);
}

//////////////////////////////////////////////////////////////////////////////
//
// antialiasing software rasterizer
//

void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
	int x0,y0,x1,y1;
	if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1))
		x0=y0=x1=y1=0; // e.g. space character
	// now move to integral bboxes (treating pixels as little squares, what pixels get touched)?
	if (ix0) *ix0 =  STBTT_ifloor(x0 * scale_x + shift_x);
	if (iy0) *iy0 = -STBTT_iceil (y1 * scale_y + shift_y);
	if (ix1) *ix1 =  STBTT_iceil (x1 * scale_x + shift_x);
	if (iy1) *iy1 = -STBTT_ifloor(y0 * scale_y + shift_y);
}
void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
	stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1);
}

void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
	stbtt_GetGlyphBitmapBoxSubpixel(font, stbtt_FindGlyphIndex(font,codepoint), scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1);
}

void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
	stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x, scale_y,0.0f,0.0f, ix0,iy0,ix1,iy1);
}

typedef struct stbtt__edge {
	float x0,y0, x1,y1;
	int invert;
} stbtt__edge;

typedef struct stbtt__active_edge
{
	int x,dx;
	float ey;
	struct stbtt__active_edge *next;
	int valid;
} stbtt__active_edge;

#define FIXSHIFT   10
#define FIX        (1 << FIXSHIFT)
#define FIXMASK    (FIX-1)

static stbtt__active_edge *new_active(stbtt__edge *e, int off_x, float start_point, void *userdata)
{
	stbtt__active_edge *z = (stbtt__active_edge *) STBTT_malloc(sizeof(*z), userdata); // @TODO: make a pool of these!!!
	float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
	STBTT_assert(e->y0 <= start_point);
	if (!z) return z;
	// round dx down to avoid going too far
	if (dxdy < 0)
		z->dx = -STBTT_ifloor(FIX * -dxdy);
	else
		z->dx = STBTT_ifloor(FIX * dxdy);
	z->x = STBTT_ifloor(FIX * (e->x0 + dxdy * (start_point - e->y0)));
	z->x -= off_x * FIX;
	z->ey = e->y1;
	z->next = 0;
	z->valid = e->invert ? 1 : -1;
	return z;
}

// note: this routine clips fills that extend off the edges... ideally this
// wouldn't happen, but it could happen if the truetype glyph bounding boxes
// are wrong, or if the user supplies a too-small bitmap
static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight)
{
	// non-zero winding fill
	int x0=0, w=0;

	while (e) {
		if (w == 0) {
			// if we're currently at zero, we need to record the edge start point
			x0 = e->x; w += e->valid;
		} else {
			int x1 = e->x; w += e->valid;
			// if we went to zero, we need to draw
			if (w == 0) {
				int i = x0 >> FIXSHIFT;
				int j = x1 >> FIXSHIFT;

				if (i < len && j >= 0) {
					if (i == j) {
						// x0,x1 are the same pixel, so compute combined coverage
						scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> FIXSHIFT);
					} else {
						if (i >= 0) // add antialiasing for x0
							scanline[i] = scanline[i] + (stbtt_uint8) (((FIX - (x0 & FIXMASK)) * max_weight) >> FIXSHIFT);
						else
							i = -1; // clip

						if (j < len) // add antialiasing for x1
							scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & FIXMASK) * max_weight) >> FIXSHIFT);
						else
							j = len; // clip

						for (++i; i < j; ++i) // fill pixels between x0 and x1
							scanline[i] = scanline[i] + (stbtt_uint8) max_weight;
					}
				}
			}
		}

		e = e->next;
	}
}

static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
{
	stbtt__active_edge *active = NULL;
	int y,j=0;
	int max_weight = (255 / vsubsample);  // weight per vertical scanline
	int s; // vertical subsample index
	unsigned char scanline_data[512], *scanline;

	if (result->w > 512)
		scanline = (unsigned char *) STBTT_malloc(result->w, userdata);
	else
		scanline = scanline_data;

	y = off_y * vsubsample;
	e[n].y0 = (off_y + result->h) * (float) vsubsample + 1;

	while (j < result->h) {
		STBTT_memset(scanline, 0, result->w);
		for (s=0; s < vsubsample; ++s) {
			// find center of pixel for this scanline
			float scan_y = y + 0.5f;
			stbtt__active_edge **step = &active;

			// update all active edges;
			// remove all active edges that terminate before the center of this scanline
			while (*step) {
				stbtt__active_edge * z = *step;
				if (z->ey <= scan_y) {
					*step = z->next; // delete from list
					STBTT_assert(z->valid);
					z->valid = 0;
					STBTT_free(z, userdata);
				} else {
					z->x += z->dx; // advance to position for current scanline
					step = &((*step)->next); // advance through list
				}
			}

			// resort the list if needed
			for(;;) {
				int changed=0;
				step = &active;
				while (*step && (*step)->next) {
					if ((*step)->x > (*step)->next->x) {
						stbtt__active_edge *t = *step;
						stbtt__active_edge *q = t->next;

						t->next = q->next;
						q->next = t;
						*step = q;
						changed = 1;
					}
					step = &(*step)->next;
				}
				if (!changed) break;
			}

			// insert all edges that start before the center of this scanline -- omit ones that also end on this scanline
			while (e->y0 <= scan_y) {
				if (e->y1 > scan_y) {
					stbtt__active_edge *z = new_active(e, off_x, scan_y, userdata);
					// find insertion point
					if (active == NULL)
						active = z;
					else if (z->x < active->x) {
						// insert at front
						z->next = active;
						active = z;
					} else {
						// find thing to insert AFTER
						stbtt__active_edge *p = active;
						while (p->next && p->next->x < z->x)
							p = p->next;
						// at this point, p->next->x is NOT < z->x
						z->next = p->next;
						p->next = z;
					}
				}
				++e;
			}

			// now process all active edges in XOR fashion
			if (active)
				stbtt__fill_active_edges(scanline, result->w, active, max_weight);

			++y;
		}
		STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w);
		++j;
	}

	while (active) {
		stbtt__active_edge *z = active;
		active = active->next;
		STBTT_free(z, userdata);
	}

	if (scanline != scanline_data)
		STBTT_free(scanline, userdata);
}

static int stbtt__edge_compare(const void *p, const void *q)
{
	stbtt__edge *a = (stbtt__edge *) p;
	stbtt__edge *b = (stbtt__edge *) q;

	if (a->y0 < b->y0) return -1;
	if (a->y0 > b->y0) return  1;
	return 0;
}

typedef struct
{
	float x,y;
} stbtt__point;

static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcount, int windings, float scale_x, float scale_y, float shift_x, float shift_y, int off_x, int off_y, int invert, void *userdata)
{
	float y_scale_inv = invert ? -scale_y : scale_y;
	stbtt__edge *e;
	int n,i,j,k,m;
	int vsubsample = result->h < 8 ? 15 : 5;
	// vsubsample should divide 255 evenly; otherwise we won't reach full opacity

	// now we have to blow out the windings into explicit edge lists
	n = 0;
	for (i=0; i < windings; ++i)
		n += wcount[i];

	e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); // add an extra one as a sentinel
	if (e == 0) return;
	n = 0;

	m=0;
	for (i=0; i < windings; ++i) {
		stbtt__point *p = pts + m;
		m += wcount[i];
		j = wcount[i]-1;
		for (k=0; k < wcount[i]; j=k++) {
			int a=k,b=j;
			// skip the edge if horizontal
			if (p[j].y == p[k].y)
				continue;
			// add edge from j to k to the list
			e[n].invert = 0;
			if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) {
				e[n].invert = 1;
				a=j,b=k;
			}
			e[n].x0 = p[a].x * scale_x + shift_x;
			e[n].y0 = p[a].y * y_scale_inv * vsubsample + shift_y;
			e[n].x1 = p[b].x * scale_x + shift_x;
			e[n].y1 = p[b].y * y_scale_inv * vsubsample + shift_y;
			++n;
		}
	}

	// now sort the edges by their highest point (should snap to integer, and then by x)
	STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare);

	// now, traverse the scanlines and find the intersections on each scanline, use xor winding rule
	stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata);

	STBTT_free(e, userdata);
}

static void stbtt__add_point(stbtt__point *points, int n, float x, float y)
{
	if (!points) return; // during first pass, it's unallocated
	points[n].x = x;
	points[n].y = y;
}

// tesselate until threshhold p is happy... @TODO warped to compensate for non-linear stretching
static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n)
{
	// midpoint
	float mx = (x0 + 2*x1 + x2)/4;
	float my = (y0 + 2*y1 + y2)/4;
	// versus directly drawn line
	float dx = (x0+x2)/2 - mx;
	float dy = (y0+y2)/2 - my;
	if (n > 16) // 65536 segments on one curve better be enough!
		return 1;
	if (dx*dx+dy*dy > objspace_flatness_squared) { // half-pixel error allowed... need to be smaller if AA
		stbtt__tesselate_curve(points, num_points, x0,y0, (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1);
		stbtt__tesselate_curve(points, num_points, mx,my, (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1);
	} else {
		stbtt__add_point(points, *num_points,x2,y2);
		*num_points = *num_points+1;
	}
	return 1;
}

// returns number of contours
stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata)
{
	stbtt__point *points=0;
	int num_points=0;

	float objspace_flatness_squared = objspace_flatness * objspace_flatness;
	int i,n=0,start=0, pass;

	// count how many "moves" there are to get the contour count
	for (i=0; i < num_verts; ++i)
		if (vertices[i].type == STBTT_vmove)
			++n;

	*num_contours = n;
	if (n == 0) return 0;

	*contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata);

	if (*contour_lengths == 0) {
		*num_contours = 0;
		return 0;
	}

	// make two passes through the points so we don't need to realloc
	for (pass=0; pass < 2; ++pass) {
		float x=0,y=0;
		if (pass == 1) {
			points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata);
			if (points == NULL) goto error;
		}
		num_points = 0;
		n= -1;
		for (i=0; i < num_verts; ++i) {
			switch (vertices[i].type) {
			case STBTT_vmove:
				// start the next contour
				if (n >= 0)
					(*contour_lengths)[n] = num_points - start;
				++n;
				start = num_points;

				x = vertices[i].x, y = vertices[i].y;
				stbtt__add_point(points, num_points++, x,y);
				break;
			case STBTT_vline:
				x = vertices[i].x, y = vertices[i].y;
				stbtt__add_point(points, num_points++, x, y);
				break;
			case STBTT_vcurve:
				stbtt__tesselate_curve(points, &num_points, x,y,
					vertices[i].cx, vertices[i].cy,
					vertices[i].x,  vertices[i].y,
					objspace_flatness_squared, 0);
				x = vertices[i].x, y = vertices[i].y;
				break;
			}
		}
		(*contour_lengths)[n] = num_points - start;
	}

	return points;
error:
	STBTT_free(points, userdata);
	STBTT_free(*contour_lengths, userdata);
	*contour_lengths = 0;
	*num_contours = 0;
	return NULL;
}

void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata)
{
	float scale = scale_x > scale_y ? scale_y : scale_x;
	int winding_count, *winding_lengths;
	stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale, &winding_lengths, &winding_count, userdata);
	if (windings) {
		stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, userdata);
		STBTT_free(winding_lengths, userdata);
		STBTT_free(windings, userdata);
	}
}

void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata)
{
	STBTT_free(bitmap, userdata);
}

unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff)
{
	int ix0,iy0,ix1,iy1;
	stbtt__bitmap gbm;
	stbtt_vertex *vertices;   
	int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);

	if (scale_x == 0) scale_x = scale_y;
	if (scale_y == 0) {
		if (scale_x == 0) return NULL;
		scale_y = scale_x;
	}

	stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,&ix1,&iy1);

	// now we get the size
	gbm.w = (ix1 - ix0);
	gbm.h = (iy1 - iy0);
	gbm.pixels = NULL; // in case we error

	if (width ) *width  = gbm.w;
	if (height) *height = gbm.h;
	if (xoff  ) *xoff   = ix0;
	if (yoff  ) *yoff   = iy0;

	if (gbm.w && gbm.h) {
		gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata);
		if (gbm.pixels) {
			gbm.stride = gbm.w;

			stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, 1, info->userdata);
		}
	}
	STBTT_free(vertices, info->userdata);
	return gbm.pixels;
}   

unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff)
{
	return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, 0.0f, 0.0f, glyph, width, height, xoff, yoff);
}

void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph)
{
	int ix0,iy0;
	stbtt_vertex *vertices;
	int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
	stbtt__bitmap gbm;   

	stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,0,0);
	gbm.pixels = output;
	gbm.w = out_w;
	gbm.h = out_h;
	gbm.stride = out_stride;

	if (gbm.w && gbm.h)
		stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0,iy0, 1, info->userdata);

	STBTT_free(vertices, info->userdata);
}

void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph)
{
	stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, glyph);
}

unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
{
	return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, stbtt_FindGlyphIndex(info,codepoint), width,height,xoff,yoff);
}   

void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint)
{
	stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, stbtt_FindGlyphIndex(info,codepoint));
}

unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
{
	return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, 0.0f,0.0f, codepoint, width,height,xoff,yoff);
}   

void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint)
{
	stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, codepoint);
}

//////////////////////////////////////////////////////////////////////////////
//
// bitmap baking
//
// This is SUPER-CRAPPY packing to keep source code small

extern int stbtt_BakeFontBitmap(const unsigned char *data, int offset,  // font location (use offset=0 for plain .ttf)
	float pixel_height,                     // height of font in pixels
	unsigned char *pixels, int pw, int ph,  // bitmap to be filled in
	int first_char, int num_chars,          // characters to bake
	stbtt_bakedchar *chardata)
{
	float scale;
	int x,y,bottom_y, i;
	stbtt_fontinfo f;
	stbtt_InitFont(&f, data, offset);
	STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
	x=y=1;
	bottom_y = 1;

	scale = stbtt_ScaleForPixelHeight(&f, pixel_height);

	for (i=0; i < num_chars; ++i) {
		int advance, lsb, x0,y0,x1,y1,gw,gh;
		int g = stbtt_FindGlyphIndex(&f, first_char + i);
		stbtt_GetGlyphHMetrics(&f, g, &advance, &lsb);
		stbtt_GetGlyphBitmapBox(&f, g, scale,scale, &x0,&y0,&x1,&y1);
		gw = x1-x0;
		gh = y1-y0;
		if (x + gw + 1 >= pw)
			y = bottom_y, x = 1; // advance to next row
		if (y + gh + 1 >= ph) // check if it fits vertically AFTER potentially moving to next row
			return -i;
		STBTT_assert(x+gw < pw);
		STBTT_assert(y+gh < ph);
		stbtt_MakeGlyphBitmap(&f, pixels+x+y*pw, gw,gh,pw, scale,scale, g);
		chardata[i].x0 = (stbtt_int16) x;
		chardata[i].y0 = (stbtt_int16) y;
		chardata[i].x1 = (stbtt_int16) (x + gw);
		chardata[i].y1 = (stbtt_int16) (y + gh);
		chardata[i].xadvance = scale * advance;
		chardata[i].xoff     = (float) x0;
		chardata[i].yoff     = (float) y0;
		x = x + gw + 2;
		if (y+gh+2 > bottom_y)
			bottom_y = y+gh+2;
	}
	return bottom_y;
}

void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule)
{
	float d3d_bias = opengl_fillrule ? 0 : -0.5f;
	float ipw = 1.0f / pw, iph = 1.0f / ph;
	stbtt_bakedchar *b = chardata + char_index;
	int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5);
	int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5);

	q->x0 = round_x + d3d_bias;
	q->y0 = round_y + d3d_bias;
	q->x1 = round_x + b->x1 - b->x0 + d3d_bias;
	q->y1 = round_y + b->y1 - b->y0 + d3d_bias;

	q->s0 = b->x0 * ipw;
	q->t0 = b->y0 * iph;
	q->s1 = b->x1 * ipw;
	q->t1 = b->y1 * iph;

	*xpos += b->xadvance;
}

//////////////////////////////////////////////////////////////////////////////
//
// font name matching -- recommended not to use this
//

// check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string
static stbtt_int32 stbtt__CompareUTF8toUTF16_bigendian_prefix(const stbtt_uint8 *s1, stbtt_int32 len1, const stbtt_uint8 *s2, stbtt_int32 len2) 
{
	stbtt_int32 i=0;

	// convert utf16 to utf8 and compare the results while converting
	while (len2) {
		stbtt_uint16 ch = s2[0]*256 + s2[1];
		if (ch < 0x80) {
			if (i >= len1) return -1;
			if (s1[i++] != ch) return -1;
		} else if (ch < 0x800) {
			if (i+1 >= len1) return -1;
			if (s1[i++] != 0xc0 + (ch >> 6)) return -1;
			if (s1[i++] != 0x80 + (ch & 0x3f)) return -1;
		} else if (ch >= 0xd800 && ch < 0xdc00) {
			stbtt_uint32 c;
			stbtt_uint16 ch2 = s2[2]*256 + s2[3];
			if (i+3 >= len1) return -1;
			c = ((ch - 0xd800) << 10) + (ch2 - 0xdc00) + 0x10000;
			if (s1[i++] != 0xf0 + (c >> 18)) return -1;
			if (s1[i++] != 0x80 + ((c >> 12) & 0x3f)) return -1;
			if (s1[i++] != 0x80 + ((c >>  6) & 0x3f)) return -1;
			if (s1[i++] != 0x80 + ((c      ) & 0x3f)) return -1;
			s2 += 2; // plus another 2 below
			len2 -= 2;
		} else if (ch >= 0xdc00 && ch < 0xe000) {
			return -1;
		} else {
			if (i+2 >= len1) return -1;
			if (s1[i++] != 0xe0 + (ch >> 12)) return -1;
			if (s1[i++] != 0x80 + ((ch >> 6) & 0x3f)) return -1;
			if (s1[i++] != 0x80 + ((ch     ) & 0x3f)) return -1;
		}
		s2 += 2;
		len2 -= 2;
	}
	return i;
}

int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2) 
{
	return len1 == stbtt__CompareUTF8toUTF16_bigendian_prefix((const stbtt_uint8*) s1, len1, (const stbtt_uint8*) s2, len2);
}

// returns results in whatever encoding you request... but note that 2-byte encodings
// will be BIG-ENDIAN... use stbtt_CompareUTF8toUTF16_bigendian() to compare
const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID)
{
	stbtt_int32 i,count,stringOffset;
	stbtt_uint8 *fc = font->data;
	stbtt_uint32 offset = font->fontstart;
	stbtt_uint32 nm = stbtt__find_table(fc, offset, "name");
	if (!nm) return NULL;

	count = ttUSHORT(fc+nm+2);
	stringOffset = nm + ttUSHORT(fc+nm+4);
	for (i=0; i < count; ++i) {
		stbtt_uint32 loc = nm + 6 + 12 * i;
		if (platformID == ttUSHORT(fc+loc+0) && encodingID == ttUSHORT(fc+loc+2)
			&& languageID == ttUSHORT(fc+loc+4) && nameID == ttUSHORT(fc+loc+6)) {
				*length = ttUSHORT(fc+loc+8);
				return (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10));
		}
	}
	return NULL;
}

static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id)
{
	stbtt_int32 i;
	stbtt_int32 count = ttUSHORT(fc+nm+2);
	stbtt_int32 stringOffset = nm + ttUSHORT(fc+nm+4);

	for (i=0; i < count; ++i) {
		stbtt_uint32 loc = nm + 6 + 12 * i;
		stbtt_int32 id = ttUSHORT(fc+loc+6);
		if (id == target_id) {
			// find the encoding
			stbtt_int32 platform = ttUSHORT(fc+loc+0), encoding = ttUSHORT(fc+loc+2), language = ttUSHORT(fc+loc+4);

			// is this a Unicode encoding?
			if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) {
				stbtt_int32 slen = ttUSHORT(fc+loc+8), off = ttUSHORT(fc+loc+10);

				// check if there's a prefix match
				stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen);
				if (matchlen >= 0) {
					// check for target_id+1 immediately following, with same encoding & language
					if (i+1 < count && ttUSHORT(fc+loc+12+6) == next_id && ttUSHORT(fc+loc+12) == platform && ttUSHORT(fc+loc+12+2) == encoding && ttUSHORT(fc+loc+12+4) == language) {
						stbtt_int32 slen = ttUSHORT(fc+loc+12+8), off = ttUSHORT(fc+loc+12+10);
						if (slen == 0) {
							if (matchlen == nlen)
								return 1;
						} else if (matchlen < nlen && name[matchlen] == ' ') {
							++matchlen;
							if (stbtt_CompareUTF8toUTF16_bigendian((char*) (name+matchlen), nlen-matchlen, (char*)(fc+stringOffset+off),slen))
								return 1;
						}
					} else {
						// if nothing immediately following
						if (matchlen == nlen)
							return 1;
					}
				}
			}

			// @TODO handle other encodings
		}
	}
	return 0;
}

static int stbtt__matches(stbtt_uint8 *fc, stbtt_uint32 offset, stbtt_uint8 *name, stbtt_int32 flags)
{
	stbtt_int32 nlen = (stbtt_int32) STBTT_strlen((char *) name);
	stbtt_uint32 nm,hd;
	if (!stbtt__isfont(fc+offset)) return 0;

	// check italics/bold/underline flags in macStyle...
	if (flags) {
		hd = stbtt__find_table(fc, offset, "head");
		if ((ttUSHORT(fc+hd+44) & 7) != (flags & 7)) return 0;
	}

	nm = stbtt__find_table(fc, offset, "name");
	if (!nm) return 0;

	if (flags) {
		// if we checked the macStyle flags, then just check the family and ignore the subfamily
		if (stbtt__matchpair(fc, nm, name, nlen, 16, -1))  return 1;
		if (stbtt__matchpair(fc, nm, name, nlen,  1, -1))  return 1;
		if (stbtt__matchpair(fc, nm, name, nlen,  3, -1))  return 1;
	} else {
		if (stbtt__matchpair(fc, nm, name, nlen, 16, 17))  return 1;
		if (stbtt__matchpair(fc, nm, name, nlen,  1,  2))  return 1;
		if (stbtt__matchpair(fc, nm, name, nlen,  3, -1))  return 1;
	}

	return 0;
}

int stbtt_FindMatchingFont(const unsigned char *font_collection, const char *name_utf8, stbtt_int32 flags)
{
	stbtt_int32 i;
	for (i=0;;++i) {
		stbtt_int32 off = stbtt_GetFontOffsetForIndex(font_collection, i);
		if (off < 0) return off;
		if (stbtt__matches((stbtt_uint8 *) font_collection, off, (stbtt_uint8*) name_utf8, flags))
			return off;
	}
}

#endif // STB_TRUETYPE_IMPLEMENTATION
